US5708401A - Waveguide coaxial converter including susceptance matching means - Google Patents

Waveguide coaxial converter including susceptance matching means Download PDF

Info

Publication number
US5708401A
US5708401A US08/560,782 US56078295A US5708401A US 5708401 A US5708401 A US 5708401A US 56078295 A US56078295 A US 56078295A US 5708401 A US5708401 A US 5708401A
Authority
US
United States
Prior art keywords
waveguide
coaxial converter
step portions
line
axis line
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US08/560,782
Other languages
English (en)
Inventor
Keiichi Umezu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Assigned to NEC CORPORATION reassignment NEC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: UMEZU, KEIICHI
Priority to US08/681,379 priority Critical patent/US5670918A/en
Application granted granted Critical
Publication of US5708401A publication Critical patent/US5708401A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/08—Coupling devices of the waveguide type for linking dissimilar lines or devices
    • H01P5/10—Coupling devices of the waveguide type for linking dissimilar lines or devices for coupling balanced lines or devices with unbalanced lines or devices
    • H01P5/103—Hollow-waveguide/coaxial-line transitions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
    • H01P5/022—Transitions between lines of the same kind and shape, but with different dimensions
    • H01P5/024—Transitions between lines of the same kind and shape, but with different dimensions between hollow waveguides

Definitions

  • This invention relates to a waveguide coaxial converter for a microwave circuit, and more particularly to, waveguide coaxial converter having a regulating means of load impedance.
  • a waveguide coaxial converter is in general used for the conversion of the propagation mode of a high-frequency signal between a waveguide and a coaxial line.
  • the impedance matching between a waveguide and a coaxial line and the biasing to a detector provided with the coaxial line is desired to be effectively achieved.
  • Japanese utility model publication No. 61-27203 discloses one type of a waveguide coaxial converter in which an insulating portion is provided at the connecting part between a ridge portion and an internal wall of the waveguide and a connecting conductor from the ridge portion is disposed through a small hole provided in the wall of the waveguide and the connecting conductor is used as a biasing terminal.
  • Japanese patent application laid-open No.63-187707 discloses a waveguide coaxial converter in which a ridge waveguide band cross section is strictly calculated such that the cut-off frequency is lower than the operating frequency, thereby increasing the operating frequency to more than one octave, and a layered dielectric is provided at the opening of the waveguide, varying the number of layers to achieve impedance matching.
  • Japanese utility model application laid-open No.57-36006 discloses a waveguide matching circuit in which a plurality of screws are deposited at intervals of ⁇ g/4 ( ⁇ :guide wavelength) on the feeding portion of the waveguide.
  • the matching range does not cover both a capacitive region and an inductive region, i.e., it is limited to the capacitive region.
  • the conventional waveguide coaxial converter is in general separated from a regulating means of load impedance, there is a disadvantage that it must be larger if it is connected with a waveguide with the regulating means of load impedance.
  • a waveguide coaxial converter comprises:
  • a waveguide which has the cross section of a hollow rectangle plugged at one end, and in which a high-frequency signal propagates;
  • At least two means for regulating a capacitive susceptance which are provided along a line having a predetermined angle to an axis line of the waveguide at a predetermined position on a wide face of the waveguide and are respectively disposed at an interval of one eighth of a guide wavelength ⁇ g in the direction of the axis line;
  • step portions for stepwise narrowing the width between both internal sidewalls of the waveguide, each of the step portions being provided on the internal sidewalls respectively, wherein the step portions are placed with a distance of one eighth of the guide wavelength in the direction of the axis line.
  • an inductive susceptance at the side of a load is increased by the step portions where the internal sidewalls are narrowed stepwise.
  • the capacitive susceptance regulating means due to the capacitive susceptance regulating means, the capacitive susceptance can be regulated.
  • the impedance matching can be carried out over the wide range from an inductive region to a capacitive region.
  • the capacitive susceptance regulating means which are provided along a line having a predetermined angle to an axis line of the waveguide at a predetermined position on a wide face of the waveguide and are respectively disposed at an interval of one eighth of a guide wavelength ⁇ g in the direction along the axis line, the overall length of the waveguide in the direction of the axis line can be significantly decreased. Moreover, the increase of the cut-off frequency caused by the step portions can be suppressed by the ridge portion with a proper shape.
  • FIG. 1A is a partially broken plan view showing a conventional waveguide coaxial converter in addition to a separated waveguide
  • FIG. 1B is a partially broken side view in FIG. 1A
  • FIG. 2A is a cross sectional view showing a waveguide coaxial converter in a preferred embodiment according to the invention
  • FIG. 2B is a cross sectional view cut along the line A--A in FIG. 2A.
  • FIG. 3 is a cross sectional view showing a waveguide matching circuit in a preferred embodiment according to the invention.
  • FIGS. 1A and 1B Before explaining a waveguide coaxial converter in the preferred embodiment, the aforementioned conventional waveguide coaxial converter will be explained in FIGS. 1A and 1B.
  • FIG. 1A and 1B show a conventional waveguide coaxial converter in which three screws 32 for adjusting the amount of insertion vertical to the longitudinal axis thereof are arranged at respective intervals of ⁇ g/4 (see FIG. 1A) on the top of a waveguide 30.
  • a capacitive susceptance can be changed according to the respective amount of insertion of the screws 32 (designated by the vertical arrows in FIG. 1B). Therefore, the matching of impedance can be performed in a practical range, though it is not the full range.
  • a waveguide coaxial converter 33 which serves as an interface to a coaxial line is, as shown in FIGS. 1A or 1B, attached to an opened end of the waveguide 30.
  • FIGS. 2A and 2B Next, a waveguide coaxial converter in a preferred embodiment will be explained in FIGS. 2A and 2B.
  • the waveguide coaxial converter 10 comprises step portions 11a, 11b, screws 12 for regulating a capacitive susceptance, a connector 13 for connecting the converter 10 with a coaxial line, a center conductor 14 in the connector 13 and a ridge portion 15.
  • the internal narrow sidewalls in the waveguide coaxial converter 10 are tapered, gradually narrowing the waveguide from the opened end toward the closed end.
  • the step portions 11a and 11b formed on the respective inside walls are spaced apart by an interval of ⁇ g/8 as shown in FIG. 2A.
  • the respective faces for forming the step portions 11a and 11b are parallel to the face on the opening of the waveguide coaxial converter 10.
  • a pair of screws (means for regulating a capacitive susceptance) 12 in which the amount of insertion (designated by the vertical arrows in FIG. 2B) in the direction of the internal wide face can be optionally regulated are arranged at predetermined positions on the internal wide face which respectively correspond to the positions of the step portions 11a, 11b.
  • a ridge portion 15 is formed in nearly the center of the internal wide face.
  • the ridge portion 15 is, as shown in FIG. 2B, provided with a tapered face in which the thickness is gradually increased as it approached the plugged end, and a flat face extending from the peak of the tapered face to the plugged end.
  • a center conductor 14 of a coaxial line is attached to the flat face of the ridge portion 15.
  • the amount of insertion of the screws 12 is changed, the attenuation of a high-frequency signal is changed. Namely, by making the amount of insertion of the screws 12 variable, the load impedance can be varied. Specifically, when the amount of insertion of the screws 12 is minimized, i.e., in the case of substantially extracting the screws 12 from the cavity, an inductive susceptance becomes predominant as a whole due to the step portions 11a, 11b formed on the internal sidewall. Therefore, regulating the capacitive susceptance by the amount of insertion of the screws 12 makes it possible that the regulation of the impedance as a whole is performed over the range from an inductive region to a capacitive region. As a result, the frequency range where the matching of impedance can be carried out is significantly enlarged.
  • the ridge portion 15 is already present for reducing the cut-off frequency as shown in FIG. 2B, it can be also used for the impedance conversion between the waveguide and the coaxial line to provide an interface for the coaxial line. Thereby, the overall length of the waveguide can be reduced.
  • such structure for the impedance conversion between the waveguide and the coaxial line in this embodiment is suitable for casting and does not need a supporting material such as Teflon® for the center conductor 14. Therefore, a waveguide coaxial converter for high power can be easily made at a reduced manufacturing cost.
  • FIG. 3 shows a waveguide matching circuit in a preferred embodiment of the invention.
  • the waveguide matching circuit 20 comprises inductive rods 21a, 21b and screws 22 for regulating a capacitive susceptance.
  • the waveguide matching circuit 20 has the inductive rods 21a and 21b which are disposed at an interval of ⁇ g/8 on the internal sidewall, replacing the step portions 11a, 11b in the waveguide coaxial converter 10 as mentioned above with regard to FIGS. 2A and 2B. Further, a pair of screws 22 are disposed on the same planes as the respective inductive rods 21a, 21b. The screws 22 are the same ones as the screws 12 in the waveguide coaxial converter as mentioned above with regard to FIG. 2A.
  • the number of the step portions 11a, 11b (see FIG. 2A) or the inductive rods 21a, 21b (see FIG. 3) is not limited to two.

Landscapes

  • Waveguide Aerials (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Optical Integrated Circuits (AREA)
  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
US08/560,782 1994-11-21 1995-11-21 Waveguide coaxial converter including susceptance matching means Expired - Fee Related US5708401A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US08/681,379 US5670918A (en) 1994-11-21 1996-07-23 Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP28693094A JP3282003B2 (ja) 1994-11-21 1994-11-21 導波管同軸変換器及び導波管整合回路
JP6-286930 1994-11-21

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US08/681,379 Division US5670918A (en) 1994-11-21 1996-07-23 Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials

Publications (1)

Publication Number Publication Date
US5708401A true US5708401A (en) 1998-01-13

Family

ID=17710802

Family Applications (2)

Application Number Title Priority Date Filing Date
US08/560,782 Expired - Fee Related US5708401A (en) 1994-11-21 1995-11-21 Waveguide coaxial converter including susceptance matching means
US08/681,379 Expired - Fee Related US5670918A (en) 1994-11-21 1996-07-23 Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials

Family Applications After (1)

Application Number Title Priority Date Filing Date
US08/681,379 Expired - Fee Related US5670918A (en) 1994-11-21 1996-07-23 Waveguide matching circuit having both capacitive susceptance regulating means and inductive materials

Country Status (8)

Country Link
US (2) US5708401A (enrdf_load_stackoverflow)
EP (1) EP0713260B1 (enrdf_load_stackoverflow)
JP (1) JP3282003B2 (enrdf_load_stackoverflow)
CN (1) CN1062382C (enrdf_load_stackoverflow)
AU (1) AU701861B2 (enrdf_load_stackoverflow)
CA (1) CA2163420C (enrdf_load_stackoverflow)
DE (1) DE69515263T2 (enrdf_load_stackoverflow)
TW (1) TW278278B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050212616A1 (en) * 2004-03-26 2005-09-29 Wistron Neweb Corporation Radiowave receiving device
US20130271235A1 (en) * 2011-01-25 2013-10-17 Nec Corporation Coaxial waveguide converter and ridge waveguide
US20160172735A1 (en) * 2013-08-23 2016-06-16 Huawei Technologies Co., Ltd. Coax-waveguide adapter
KR20230145821A (ko) * 2022-04-11 2023-10-18 전우금 전극 교체형 전기 자극기
USD1072775S1 (en) * 2022-07-11 2025-04-29 Kyocera Corporation Waveguide converter

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2338607B (en) * 1998-01-17 2002-09-11 Bsc Filters Ltd Ultra short co-axial to waveguide end launch transition
US6075422A (en) * 1998-06-01 2000-06-13 R.F. Technologies, Inc. Apparatus for optimization of microwave processing of industrial materials and other products
RU2211508C2 (ru) * 2001-07-10 2003-08-27 Федеральное государственное унитарное предприятие "Научно-производственное объединение прикладной механики им. акад. М.Ф. Решетнёва" Коаксиально-волноводный переход
DE102005061671B3 (de) * 2005-12-22 2007-04-05 Spinner Gmbh Koaxialer Wellenwiderstandstransformator
RU2325017C2 (ru) * 2006-04-24 2008-05-20 Государственное образовательное учреждение высшего профессионального образования "Саратовский государственный технический университет" (СГТУ) Узкополосный коаксиально-волноводный переход уголкового типа
JP5199962B2 (ja) * 2009-08-05 2013-05-15 三菱重工業株式会社 真空処理装置
JP6407106B2 (ja) * 2015-07-06 2018-10-17 三菱電機株式会社 方向性結合器
EP3665740B1 (en) * 2017-08-09 2021-12-01 Sony Group Corporation Waveguide antenna magnetoelectric matching transition
CN111063973B (zh) * 2019-11-28 2021-11-30 京信通信技术(广州)有限公司 射频器件及同轴端口与波导端口的转换装置
CN111816967B (zh) * 2020-07-16 2022-04-01 成都赛纳微波科技有限公司 一种大功率波导调配器
RU2751151C1 (ru) * 2020-08-25 2021-07-08 Закрытое акционерное общество "Космические Информационные Аналитические Системы" (ЗАО "КИА Системы") Способ поворота плоскости поляризации и стовосьмидесятиградусный поляризатор, его реализующий
JP7304660B1 (ja) * 2022-11-01 2023-07-07 株式会社ニッシン 電力分配合成器
CN115966870B (zh) * 2022-12-28 2023-08-25 西安艾力特电子实业有限公司 一种接近截止频率使用的同轴矩形波导转换结构
CN117949882B (zh) * 2024-03-26 2024-07-05 广东省计量科学研究院（华南国家计量测试中心） 2450MHz微波漏能仪校准装置

Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432094A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Impedance transformer for wave guides
US2865009A (en) * 1953-12-14 1958-12-16 Litton Industries Inc Tuning iris for wave guides
US2922127A (en) * 1957-01-16 1960-01-19 Edward C Dench Output coupling
GB934912A (en) * 1961-01-14 1963-08-21 Telefunken Patent Improvements in or relating to co-axial cable-waveguide coupling transitions
US3449698A (en) * 1967-03-24 1969-06-10 Hughes Aircraft Co Reactive waveguide post
US3471810A (en) * 1966-11-14 1969-10-07 Varian Associates High power microwave matching structure employing two sets of cumulatively reinforcing spaced wave reflective elements
US3654571A (en) * 1969-09-19 1972-04-04 Licentia Gmbh Broadband end coupling
US3725824A (en) * 1972-06-20 1973-04-03 Us Navy Compact waveguide-coax transition
WO1984004855A1 (en) * 1983-05-20 1984-12-06 Hughes Aircraft Co Dual band phased array using wideband elements with diplexer
SU1190431A1 (ru) * 1983-07-27 1985-11-07 Gurevich Roman V Согласующее устройство
JPS6127203A (ja) * 1984-07-18 1986-02-06 松下電工株式会社 半乾式セメント系材料のプレス成型装置
US4623848A (en) * 1983-07-19 1986-11-18 Matsushita Electric Industrial Co., Ltd. Microwave preamplifier
EP0247794A2 (en) * 1986-05-29 1987-12-02 Btg International Limited Matching asymmetrical discontinuities in transmission lines
JPS63187707A (ja) * 1987-01-28 1988-08-03 Fujitsu Ltd 超小形広帯域アンテナ
US4803446A (en) * 1985-03-28 1989-02-07 New Japan Radio Co., Ltd. Low noise microwave amplifier
US5111164A (en) * 1986-05-29 1992-05-05 National Research Development Corporation Matching asymmetrical discontinuities in a waveguide twist
US5387884A (en) * 1993-07-13 1995-02-07 Litton Systems, Inc. Impedance matching flange for a rectangular waveguide

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5354945A (en) * 1976-10-29 1978-05-18 Mitsubishi Electric Corp Waveguide converter
JPS5736006A (en) * 1980-08-11 1982-02-26 Mitsubishi Electric Corp Rolling system
JPH07120887B2 (ja) * 1990-09-07 1995-12-20 日本電信電話株式会社 方向性結合器

Patent Citations (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432094A (en) * 1942-07-30 1947-12-09 Bell Telephone Labor Inc Impedance transformer for wave guides
US2865009A (en) * 1953-12-14 1958-12-16 Litton Industries Inc Tuning iris for wave guides
US2922127A (en) * 1957-01-16 1960-01-19 Edward C Dench Output coupling
GB934912A (en) * 1961-01-14 1963-08-21 Telefunken Patent Improvements in or relating to co-axial cable-waveguide coupling transitions
US3471810A (en) * 1966-11-14 1969-10-07 Varian Associates High power microwave matching structure employing two sets of cumulatively reinforcing spaced wave reflective elements
US3449698A (en) * 1967-03-24 1969-06-10 Hughes Aircraft Co Reactive waveguide post
US3654571A (en) * 1969-09-19 1972-04-04 Licentia Gmbh Broadband end coupling
US3725824A (en) * 1972-06-20 1973-04-03 Us Navy Compact waveguide-coax transition
WO1984004855A1 (en) * 1983-05-20 1984-12-06 Hughes Aircraft Co Dual band phased array using wideband elements with diplexer
US4623848A (en) * 1983-07-19 1986-11-18 Matsushita Electric Industrial Co., Ltd. Microwave preamplifier
SU1190431A1 (ru) * 1983-07-27 1985-11-07 Gurevich Roman V Согласующее устройство
JPS6127203A (ja) * 1984-07-18 1986-02-06 松下電工株式会社 半乾式セメント系材料のプレス成型装置
US4803446A (en) * 1985-03-28 1989-02-07 New Japan Radio Co., Ltd. Low noise microwave amplifier
EP0247794A2 (en) * 1986-05-29 1987-12-02 Btg International Limited Matching asymmetrical discontinuities in transmission lines
US5111164A (en) * 1986-05-29 1992-05-05 National Research Development Corporation Matching asymmetrical discontinuities in a waveguide twist
JPS63187707A (ja) * 1987-01-28 1988-08-03 Fujitsu Ltd 超小形広帯域アンテナ
US5387884A (en) * 1993-07-13 1995-02-07 Litton Systems, Inc. Impedance matching flange for a rectangular waveguide

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
Ohm sha, Microwave Circuit , Oct. 31, 1958, pp. 224 225. *
Ohm-sha, "Microwave Circuit", Oct. 31, 1958, pp. 224-225.
Patent Abstracts of Japan, vol. 2, No. 90 (E 78) 4174 , Jul. 22, 1978. *
Patent Abstracts of Japan, vol. 2, No. 90 (E-78) 4174!, Jul. 22, 1978.
Von G. von Dall Armi, Brietbandiger und hochbelastbarer U bergang zwischen einem Hohlleiter und einer Koaxialleitung , Frequenz , vol. 20, No. 8, Aug. 1966, pp. 270 272. *
Von G. von Dall'Armi, "Brietbandiger und hochbelastbarer Ubergang zwischen einem Hohlleiter und einer Koaxialleitung", Frequenz, vol. 20, No. 8, Aug. 1966, pp. 270-272.

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050212616A1 (en) * 2004-03-26 2005-09-29 Wistron Neweb Corporation Radiowave receiving device
US20130271235A1 (en) * 2011-01-25 2013-10-17 Nec Corporation Coaxial waveguide converter and ridge waveguide
US9118098B2 (en) * 2011-01-25 2015-08-25 Nec Corporation Coaxial waveguide converter and ridge waveguide
US20160172735A1 (en) * 2013-08-23 2016-06-16 Huawei Technologies Co., Ltd. Coax-waveguide adapter
US9972881B2 (en) * 2013-08-23 2018-05-15 Huawei Technologies Co., Ltd. Coaxial line-to-waveguide adapter comprising a left-handed material used as an electromagnetic parameter adjusting component
KR20230145821A (ko) * 2022-04-11 2023-10-18 전우금 전극 교체형 전기 자극기
KR102832435B1 (ko) 2022-04-11 2025-07-09 전우금 전극 교체형 전기 자극기
USD1072775S1 (en) * 2022-07-11 2025-04-29 Kyocera Corporation Waveguide converter

Also Published As

Publication number Publication date
DE69515263T2 (de) 2000-06-21
DE69515263D1 (de) 2000-04-06
AU3797295A (en) 1996-05-30
CA2163420C (en) 1999-07-27
EP0713260B1 (en) 2000-03-01
US5670918A (en) 1997-09-23
CA2163420A1 (en) 1996-05-22
JPH08148911A (ja) 1996-06-07
AU701861B2 (en) 1999-02-04
TW278278B (enrdf_load_stackoverflow) 1996-06-11
CN1131826A (zh) 1996-09-25
JP3282003B2 (ja) 2002-05-13
EP0713260A1 (en) 1996-05-22
CN1062382C (zh) 2001-02-21

Similar Documents

Publication Publication Date Title
US5708401A (en) Waveguide coaxial converter including susceptance matching means
US6255921B1 (en) Dielectric waveguide resonator, dielectric waveguide filter, and method of adjusting the characteristics thereof
US11139548B2 (en) Dual-mode monoblock dielectric filter and control elements
US4963844A (en) Dielectric waveguide-type filter
US3737816A (en) Rectangular cavity resonator and microwave filters built from such resonators
US20010040490A1 (en) Transmission line and transmission line resonator
EP1034576B1 (en) Multi surface coupled coaxial resonator
JP3672241B2 (ja) 導波管／マイクロストリップ線路変換器およびこれを用いた高周波パッケージ
US6396366B1 (en) Coaxial cavity resonator
US6031436A (en) Single and dual mode helix loaded cavity filters
JPH10173407A (ja) 導波管形分波器、および導波管形分波器の製造方法
US5160906A (en) Microstripe filter having edge flared structures
US5831495A (en) Dielectric filter including laterally extending auxiliary through bores
JP2003078312A (ja) 誘電体導波管型フィルタ及びその特性調整方法
US7403085B2 (en) RF module
US5629656A (en) Dielectric resonator apparatus comprising connection conductors extending between resonators and external surfaces
US5559485A (en) Dielectric resonator
CN115425382A (zh) 三模介质谐振器及介质滤波器
CN211670303U (zh) 超宽带加脊正交模耦合器(omt)
JPS625702A (ja) 帯域通過形フイルタ
EP3991242B1 (en) A waveguide band-stop filter arrangement
JPH10135717A (ja) 結合線路形方向性結合器
JP2000101308A (ja) 導波管型フィルタ
JPH11308022A (ja) 線路変換分岐回路およびアンテナ共用装置
JPH024163B2 (enrdf_load_stackoverflow)

Legal Events

Date Code Title Description
AS Assignment

Owner name: NEC CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:UMEZU, KEIICHI;REEL/FRAME:007902/0934

Effective date: 19960116

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 4

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20060113